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BFI to OSN: distance & flight time
Seattle (Boeing Field King County International Airport) → Osan (Osan Air Base)
5,199 mi
8,366 km · 4,518 nm
10h 40m
estimated nonstop flight time
+16h
time difference · heading northwest
See live BFI→OSN fares Phone-only fares on this route — call free
Flight time details
5,199 miles nonstop takes roughly 10h 40m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 16-hour time gain when reading arrival times on your ticket.
The two airports
- BFI — Boeing Field King County International Airport · Seattle, United States
- OSN — Osan Air Base · Osan, South Korea
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near BFI
- SEA · Seattle Tacoma International Airport6 mi away
- RNT · Renton Municipal Airport5 mi away
- PWT · Bremerton National Airport22 mi away
- TIW · Tacoma Narrows Airport22 mi away
Near OSN
- ICN · Incheon International Airport41 mi away
- SWU · Suwon Airport10 mi away
- SSN · Seoul Air Base (K-16)25 mi away
- GMP · Gimpo International Airport35 mi away
Frequently asked questions
How far is BFI from OSN?
The flight distance from Seattle (BFI) to Osan (OSN) is 5,199 miles (8,366 km, 4,518 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BFI to OSN?
A nonstop flight takes about 10h 40m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Seattle and Osan?
Osan is 16 hours ahead of Seattle.
What is the cheapest way to fly from BFI to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BFI–OSN that never appear on search engines, with no booking fees.